DC-900400-1.5, Duracast 400 Gallon Plastic Storage Tank | 900400 Resilient and able to store a broad PH range, these vertical storage tanks are the perfect vessels for holding hazardous contents like corrosive chemicals or certain strong acids. The tanks are manufactured following specific instructions to create high-quality products that last. The polyethylene resin is made with UV stabilizers for outdoor use. The resin is also FDA approved, which allows you to store potable water. These tanks are free-standing and are supported by a solid pad. The vented lid is 16 inches in diameter, which makes draining and filling contents more efficient. To make calculating content levels easier for you, these tanks feature molded-in measurement graduations. The natural white tanks are translucent, which is also useful for viewing contents.